4. Your Tongue

Aside from making your lady very happy, a study suggests that a little cunnilingus can actually limit the likelihood of your partner cheating. Also, according to an analysis of 33 studies by author Elisabeth Lloyd, only 25% of women are consistently orgasmic during intercourse, (with 52% stopping her man because she was afraid of taking too long). Meaning, for three quarters of women, penis size doesn't really lend itself to her orgasm. Likewise, a survey of 19,000 from sex researcher, Juliet Ritchers, Ph.D., found more than 90% of women reached orgasm when their partners used oral stimulation, making your tongue a more effective orgasm-generator.